Bladder
Nonurothelial benign tumors
Post-operative granulomas

Author: Monika Roychowdhury, M.D. (see Authors page)

Revised: 14 June 2016, last major update December 2014

Copyright: (c) 2003-2016, PathologyOutlines.com, Inc.

PubMed Search: Post-operative granulomas [title]
Definition / General
Etiology
  • May be due to metals deposited during diathermy, local reaction to tissue necrosis or hypersensitivity reaction (Urology 1990;35:454)
  • Includes “starch” granulomas (Urology 1976;8:507)
Micro Description
  • Palisading histiocytes or giant cells surrounding central necrosis (resembling rheumatoid nodules) or foreign body type granuloma
  • Lesions heal by fibrous scarring
Micro Images

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Post-resection

Differential Diagnosis
  • Granulomatous cystitis: terms may overlap; often refers to patients with infectious etiology and no distinct mass